svg_test.py: wrap test shape elements in <svg> root tag
svg_test.py: wrap test shape elements in <svg> root tag

A <path> element is not an SVG path unless contained in an <svg> element with correct xmlns.
picosvg can only parse whole svg documents, not parts.

googlefonts/picosvg,googlefonts/picosvg,googlefonts/picosvg